Make a bridge from a circle of fifths. How simple. Since the introduction is in C major, go up a 5:4 (17 steps in 53) to E minor, then down a 3:2 (31 steps) to A, down a 3:2 to D, down a 3:2 to G, then up a 77:76 (one step) to G+, then down a 3:2 (31 steps) back to C major. 77:76 is the ratio of a single step in 53 tone equal temperament (or Equal Divisions of the Octave, EDO). If the 3:2 were really a 3:2 instead of 31 steps of 53 EDO, and if the 5:4 were really a 5:4 instead of 17 steps of the 53 EDO, then the comma would be 81:80, instead of 77:76. But it’s close enough for audio work.

I added a finger piano playing arpeggio based on descending triads. 6:5:4 and 11:9:7 in the key of C.

The percussion is more of that sitka spruce board with the contact microphone and an assortment of combs, rocks, screws, and other devices glued to the surface. One makes a kind of “cookie” sound from a metal comb with different length prongs.

These are samples from an instrument I made in 1975 or so. It’s a piece of 1/4 inch Sitka Spruce, with a contact microphone attached. I’ve glued assorted noise makers to the surface of the wood. Each is rubbed with rosined fingers, struck, or scraped with small tools. I call it a dry spring.

Consider it a requirement that I write at least one piece in 53 tone equal before I turn 54 in March. Equal sure is easier for modulation. This one stays in the Partch tonality diamond, but it could easily just wander out at a moment’s notice.